def test_defaultdictkey():
d = recorder._defaultdictkey(lambda k: [str(k) + "k"])
assert isinstance(d["abc"], list)
assert 2 not in d
d[1].append("hello")
assert d[1] == ["1k", "hello"]
d[1].append("bar")
assert d[1] == ["1k", "hello", "bar"]
def test_defaultdictkey_no_factory():
d = recorder._defaultdictkey()
with pytest.raises(KeyError):
d[1]